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A student writes the length of an object measured from a metre ruler as 4.20 cm. Is he justified in writing this value? Explain



The least count of a meter scale is generally 1mm which is 0.1 cm. So you can't measure any length with an accuracy of .01 cm with a meter scale.

He must write 4.2 cm although 4.2 and 4.20 are same
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